Role of material properties and mesostructure on dynamic deformation and shear instability in Al-W granular composites

Dynamic experiments with Al-W granular/porous composites revealed qualitatively different behavior with respect to shear localization depending on bonding between Al particles. Two-dimensional numerical modeling was used to explore the mesomechanics of the large strain dynamic deformation in Al-W granular/porous composites and explain the experimentally observed differences in shear localization between composites with various mesostructures. Specifically, the bonding between the Al particles, the porosity, the roles of the relative particle sizes of Al and W, the arrangements of the W particles, and the material properties of Al were investigated using numerical calculations. It was demonstrated in simulations that the bonding between the "soft" Al particles facilitated shear localization as seen in the experiments. Numerical calculations and experiments revealed that the mechanism of the shear localization in granular composites is mainly due to the local high strain flow of "soft" Al around the "rigid" W particles causing localized damage accumulation and subsequent growth of the meso/macro shear bands/cracks. The "rigid" W particles were the major geometrical factor determining the initiation and propagation of "kinked" shear bands in the matrix of "soft" Al particles, leaving some areas free of extensive plastic deformation as observed in experiments and numerical calculations.Comment: 10 pages, 14 figures, submitted to Journal of Applied Physic

Anesthesia and cognitive performance in children: No evidence for a causal relationship

* Both authors contributed evenly to the manuscript Recent findings of an association between anesthesia administration in the first three years of life and later learning disabilities have created concerns that anesthesia has neurotoxic effects on synaptogenesis, causing later learning problems. An alternative hypothesis is that those children who are likely to undergo surgery early in life have significant medical problems that are associated with a vulnerability to learning disabilities. These two hypotheses were evaluated in a monozygotic concordant–discordant twin design. Data on anesthesia administration and learning abilities and disabilities were available for 1,143 monozygotic twin pairs (56 % female) from the Netherlands Twin Registry. Parents of the twins reported on anesthesia use before age 3 and again between ages 3 and 12 years. Near age 12, educational achievement and cognitive problems were assessed with standardized tests and teacher ratings. Results showed that twins who were exposed to anesthesia before age 3 had significantly lower educational achievement scores and significantly more cognitive problems than twins not exposed to anesthesia. However, there was one important exception: the unexposed co-twin from discordant pairs did not differ from their exposed cotwin. Thus, there is no evidence for a causal relationship between anesthesia administration and later learning-related outcomes in this sample. Rather, there is evidence for early anesthesia being a marker of an individual’s vulnerability for later learning problems, regardless of their exposure to anesthesia

Loads Model Development and Analysis for the F/A-18 Active Aeroelastic Wing Airplane

The Active Aeroelastic Wing airplane was successfully flight-tested in March 2005. During phase 1 of the two-phase program, an onboard excitation system provided independent control surface movements that were used to develop a loads model for the wing structure and wing control surfaces. The resulting loads model, which was used to develop the control laws for phase 2, is described. The loads model was developed from flight data through the use of a multiple linear regression technique. The loads model input consisted of aircraft states and control surface positions, in addition to nonlinear inputs that were calculated from flight-measured parameters. The loads model output for each wing consisted of wing-root bending moment and torque, wing-fold bending moment and torque, inboard and outboard leading-edge flap hinge moment, trailing-edge flap hinge moment, and aileron hinge moment. The development of the Active Aeroelastic Wing loads model is described, and the ability of the model to predict loads during phase 2 research maneuvers is demonstrated. Results show a good match to phase 2 flight data for all loads except inboard and outboard leading-edge flap hinge moments at certain flight conditions. The average load prediction errors for all loads at all flight conditions are 9.1 percent for maximum stick-deflection rolls, 4.4 percent for 5-g windup turns, and 7.7 percent for 4-g rolling pullouts

Flamingo Vol. I N 3

Voo-Doo. Untitled. Prose. 1. Widow. Untitled. Prose. 1. Tiger. Untitled. Prose. 1. Purple Cow. Untitled. Prose. 1. Anonymous. Untitled. Prose. 1. Life. Untitled. Prose. 2. Yale Record. Untitled. Prose. 2. Voo-Doo. Untitled. Prose. 2. Sour Owl. Untitled. Prose. 2. Puppet. Untitled. Prose. 2. Sun Dial. Untitled. Prose. 2. Anonymous. Untitled. Prose. 2. Nottingham, Ruth. Teddy . Prose. 5. Grogan. Untitled. Picture. 7. Anonymous. Untitled. Prose. 7. Anonymous. An Easy One . Prose. 7. Anonymous. How Terrible! Prose. 7. Anonymous. Untitled. Prose. 7. Anonymous. Untitled. Poem. 7. F.H.G. Untitled. Picture. 7. Wood, J.E.F. When mother Went to College . Prose. 8. E.D.T. Chicago Corn Exchange . Poem. 8. Anonymous. Untitled. Prose. 8. Anonymous. Untitled. Poem. 8. Anonymous. All But . Prose. 8. R.D.B. Roscoe to The Rescue . Prose. 9. Leet, L.D. On The Efficacy of Dreams . Prose. 10. Orange Ade. The Fable of the Coffin Nailer . Prose. 11. Orange Ade. Time Wasted . Prose. 11. Orange Ade. The Americanized Boy . Prose. 11. Orange Ade. Anything to Oblige . Prose. 11. Orange Ade. Tit For Tat . Prose. 11. Orange Ade. Good Alibi . Prose. 11. Orange Ade. Untitled. Prose. 11. Grogan. Untitled. Picture. 11. Lusk, R.G. On The Absurdity of Catching Fish When A-Fishing . Prose. 12. Anonymous. Co-eds and Plain Eds in 1950 . Picture. 13. Potter, W.M. Letters of A Japanese Sandman . Prose. 13. Anonymous. Ex Facultate . Prose. 13. Anonymous. Untitled. Prose. 13. R.J.S. An Uplifting Influence . Picture. 13. Anonymous. Consider the Luxite Girl . Poem. 14. Anonymous. Shades of Orpheus . Poem. 14. Anonymous. With The Gospel Team . Poem. 14. Anonymous. Untitled. Prose. 14. Anonymous. Untitled. Poem. 14. Anonymous. A Dirty Trick . Prose. 14. Taylor, Elsie D. Vestigial Customs . Prose. 15. Anonymous. Untitled. Prose. 16. Anonymous. A New version of Anthropology . Prose. 18. Anonymous. A New version of Anthropology . Picture. 18. Anonymous. Untitled. Prose. 18. Funk, Dorothy K. Untitled. Picture. 18. Anonymous. A Deep one . Prose. 18. Anonymous. Take His Name . Prose. 18. Olney, Clarke. The Evolution of An Intellectual . Prose. 19. Anonymous. Untitled. Prose. 19. Anonymous. Untitled. Prose. 20. W.A.W. On Getting Up For Breakfast . Prose. 20. McCann. Untitled. Picture. 21. Anonymous. Untitled. Prose. 21. Anonymous. S.S.S. . Prose. 21. Anonymous. The Judge Disagreed . Prose. 21. Anonymous. The Modern Woman . Prose. 21. Anonymous. Denison Slang in Japan . Prose. 22. Anonymous. Being Specific . Prose. 22. Anonymous. Then The Fun Began . Prose. 22. Anonymous. Then The Fun Began . Prose. 22. Anonymous. Chess Nuts . Poem. 22. Anonymous. Chess Nuts . Picture. 22. Funk, Dorothy K. Untitled. Picture. 22. Anonymous. Untitled. Prose. 22. Reel, Virginia. Untitled. Prose. 22. Anonymous. Untitled. Prose. 23. Anonymous. Take This to Heart . Prose. 23. Anonymous. Stepping Out . Picture. 23. Olney, Clarke. Untitled. Picture. 23. Anonymous. To Lalage . Prose. 23. Anonymous. Untitled. Poem. 24. Anonymous. Description of the Day . Prose. 25. Anonymous. Untitled. Prose. 25. Voo-Doo. Good Bizziness . Prose. 26. Anonymous. Fore! . Prose. 26. Anonymous. Untitled. Prose. 26. Brelsford, Ernest C. Souveniring . Prose. 27. Anonymous. Untitled. Prose. 30. Burr. Sweet Dreams . Prose. 30. Jester. Untitled. Prose. 30. Judge. Untitled. Prose. 30. Goblin. Untitled. Prose. 30. Cracker. Sanitation . Poem. 32. Anonymous. Untitled. Prose. 32. Jester. Untitled. Prose. 32. Goblin. Untitled. Prose. 32. Record. Untitled. Prose. 32. Linotype. Untitled. Prose. 32. Holt, Kilburn. The Schemer\u27s Lament . Poem. 7. Owen, Ernest t. Mother . Poem. 3. Owen, Ernest T. To--- . Poem. 24

Use of a Natural Isotopic Signature in Otoliths to Evaluate Scale-Based Age Determination for American Shad

We used delta O-18 signatures in otoliths as a natural tag for hatch year to evaluate the scale-based age determination method used for adult American shad Alosa sapidissima in the York River, Virginia. Juveniles of the 2002 year-class exhibited high delta O-18 values in otolith cores that identified adult members of the cohort as they returned to spawn. Recruitment of the 2002 cohort was monitored for three consecutive years, identifying age-4, age-5, and age-6 individuals of the York River stock. The scale-based age determination method was not suitable for aging age-4, age-5, or age-6 American shad in the York River. On average, 50% of the individuals from the 2002 year-class were aged incorrectly using the scale-based method. These results suggest that the standard age determination method used for American shad is not applicable to the York River stock. Scientists and managers should use caution when applying scale-based age estimates to stock assessments for American shad in the York River and throughout their range, as the applicability of the scale-based method likely varies for each stock. This study highlights a promising new direction for otolith geochemistry to provide cohort-specific markers, and it identifies several factors that should be considered when applying the technique in the future

Cenozoic Antarctic DiatomWare/BugCam: An aid for research and teaching

Cenozoic Antarctic DiatomWare/BugCam© is an interactive, icon-driven digital-imagedatabase/software package that displays over 500 illustrated Cenozoic Antarctic diatom taxa along with original descriptions (including over 100 generic and 20 family-group descriptions). This digital catalog is designed primarily for use by micropaleontologists working in the field (at sea or on the Antarctic continent) where hard-copy literature resources are limited. This new package will also be useful for classroom/lab teaching as well as for any paleontologists making or refining taxonomic identifications at the microscope. The database (Cenozoic Antarctic DiatomWare) is displayed via a custom software program (BugCam) written in Visual Basic for use on PCs running Windows 95 or later operating systems. BugCam is a flexible image display program that utilizes an intuitive thumbnail “tree” structure for navigation through the database. The data are stored on Micrsosoft EXCEL spread sheets, hence no separate relational database program is necessary to run the package

Preliminary Integrated Chronostratigraphy of the AND-2A Core, ANDRILL Southern McMurdo Sound Project, Antarctica

We use all available chronostratigraphic constraints – biostratigraphy, magnetostratigraphy, radioisotopic dates, strontium-isotope stratigraphy, and correlation of compositional and physical properties to well-dated global or regional records – to construct a preliminary age model for ANDRILL SMS Project’s AND-2A drillcore (77°45.488’S, 165°16.605’E, 383.57 m water depth). These diverse chronostratigraphic constraints are consistent with each other and are distributed throughout the 1138.54 m-thick section, resulting in a well-constrained age model. The sedimentary succession comprises a thick early and middle Miocene section below 224.82 mbsf and a condensed middle/late Miocene to Recent section above this. The youngest sediments are Brunhes age (<0.781 Ma), as confirmed by a radioisotopic age of 0.691±0.049 Ma at 10.23 mbsf and the occurrence of sediments that have normal magnetic polarity down to ~31.1 mbsf, which is interpreted to be the Brunhes/Matuyama reversal (0.781 Ma). The upper section is punctuated by disconformities resulting from both discontinuous deposition and periods of extensive erosion typical of sedimentary environments at the margin of a dynamic ice sheet. Additional breaks in the section may be due to the influence of tectonic processes. The age model incorporates several major hiatuses but their precise depths are still somewhat uncertain, as there are a large number of erosional surfaces identified within the stratigraphic section. One or more hiatuses, which represent a total 7 to 8 million years of time missing from the sedimentary record, occur between about 50 mbsf and the base of Lithostratigraphic Unit (LSU) 3 at 122.86 mbsf. Similarly, between about 145 mbsf and the base of LSU 4 at 224.82 mbsf, one or more hiatuses occur on which another 2 to 3 million years of the sedimentary record is missing. Support for the presence of these hiatuses comes from a diatom assemblage that constrains the age of the core from 44 to 50 mbsf to 2.06-2.84 Ma, two radioisotopic dates (11.4 Ma) and a Sr‑isotope date (11.7 Ma) that indicate the interval from 127 to 145 mbsf was deposited between 11.4 and 11.7 Ma, and three diatom occurrence datums from between 225.38 and 278.55 mbsf that constrain the age of this upper part of Lithostratigraphic Unit (LSU) 5 to 14.29 - 15.89 Ma. Below the boundary between LSU 5 and 6 sedimentation was relatively continuous and rapid and the age model is well-constrained by 9 diatom datums, seven 40Ar-39Ar dates, one Sr-isotope date, and 19 magnetozones. Even so, short hiatuses (less than a few hundred thousand years) undoubtedly occur but are beyond the resolution of current chronostratigraphic age constraints. Diatom first and last occurrence datums provide particularly good age control from the top of LSU 6 down to 771.5 mbsf (in LSU 10), where the First Occurrence (FO) of Thalassiosira praefraga (18.85 Ma) is observed. The diatom datum ages are supported by radioisotopic dates of 17.30±0.31 Ma at 640.14 mbsf (in LSU 9) and 18.15±0.35 and 17.93±0.40 Ma for samples from 709.15 and 709.18 mbsf (in LSU 10), respectively, and 18.71±0.33 Ma for a sample from 831.67 mbsf (in LSU 11). The sediments from 783.69 mbsf to the base of the hole comprise two thick normal polarity magnetozones that bound a thinner reversed polarity magnetozone (958.59 - 985.64 mbsf). This polarity sequence most likely encompasses Chrons C5En, C5Er, and C6n (18.056 - 19.772 Ma or slightly older given uncertainties in this section of the geomagnetic polarity timescale), but could be also be Chrons C6n, C6r, and C6An.1n (18.748 - 20.213 Ma). Either polarity sequence is compatible with the 40Ar–39Ar age of 20.01±0.35 Ma obtained from single-grain analyses of alkali feldspar from a tephra sample from a depth of 1093.02 mbsf, although the younger interpretation allows a better fit with chronostratigraphic data up-core. Given this age model, the mean sedimentation rate is about 18 cm/k.y. from the top of LSU 6 to the base of the hole.Published221-2202.2. Laboratorio di paleomagnetismoN/A or not JCRreserve

The not-so-barren ranges

© Thesis Eleven Pty, Ltd., SAGE Publications. This is an impressionistic and informal essay written near the end of a novelist's Australia Research Council funded research project: 'Developing narratives from language and stories indigenous to the south coast of Western Australia', and informed by how that research project morphed into an emphasis on revitalization of Noongar language, and the attempt to restore connections between a particular Creation Story and landscape in an area regarded as 'massacre territory'. A sympathetic reader might think of the topic as 'The Wirlomin Noongar Language and Stories Project meets The Barren Ranges'